Glenn, Thanks again for the help. While pursuing your suggestion I introduced a bug in my shaders which led to me seeing that the default point cloud rendering was somehow having the overlay texture successfully applied. This made me think that the data was in the gl uniforms somewhere and after a few hours I found them in the gl_EyePlaneS/T variables allowing me to compute my texture cords with:
vec2 tc; vec4 v = gl_ModelViewMatrix * gl_Vertex; tc.x = dot(v, gl_EyePlaneS[1]); tc.y = dot(v, gl_EyePlaneT[1]); This assumes that my overlay was set to use texture unit 1. I figured I would respond with the answer since I found other instances of users asking about this system and often times those questions seemed to reach you. The result of my search is very confusing (even though it works) since my overlay is set to be object dependant and at no point did I find any code associated with an object dependant overlay doing anything with the eye plane settings that would be applied to the general render. - Loren From: [email protected] [mailto:[email protected]] On Behalf Of Glenn Waldron Sent: Wednesday, May 09, 2012 2:57 PM To: OpenSceneGraph Users Subject: Re: [osg-users] osgSim::OverlayNode and Point Clouds OverlayNode.cpp has some shader code in it you might look at. In osgEarth we pass in a texgen matrix in a uniform, then in the vertex shader say: gl_TexCoord[1] = texGenMatrix * osg_ViewMatrixInverse * gl_ModelViewMatrix * gl_Vertex; Then in the frag shader: vec2 tc = gl_TexCoord[1].xy / gl_TexCoord[1].q; vec4 texel = texture2D( texture_1, tc ); Or, I I believe you could also call: vec4 texel = texture2Dproj( projTex, gl_TexCoord[1] ); ..but I've never tried it. HTH. Glenn Waldron / @glennwaldron On Wed, May 9, 2012 at 3:12 PM, Loren Hoffman <[email protected]<mailto:[email protected]>> wrote: Glenn, Thanks for the response. I got the texture showing up in a test scenario but am having a problem computing the texture coordinates. I looked through the overlaynode's header file and didn't see anything which I could use to compute the texture coordinates but did find that the implementation file has some code for creating a matrix which can (I think) convert the gl_Vertex into a valid coordinate but then I couldn't find anything specifying where it would be bound to. I randomly tried the first few gl_TextureMatrices but either they don't contain the matrix or I am using it wrong. Currently I am attempting: vec4 col = texture2D(overlay, (gl_TextureMatrix[1] * gl_Vertex).xy); where using index 1 is just one of the tests. Any help would again be appreciated. Thanks, - Loren From: [email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Glenn Waldron Sent: Wednesday, May 09, 2012 1:17 PM To: OpenSceneGraph Users Subject: Re: [osg-users] osgSim::OverlayNode and Point Clouds Loren, If your point cloud has a custom shader, make sure that shader is rendering the projected texture used by OverlayNode. Glenn Waldron / @glennwaldron On Wed, May 9, 2012 at 2:05 PM, Loren Hoffman <[email protected]<mailto:[email protected]>> wrote: Hello All, I have a setup where I need to project an overlay node's sub graph onto a point cloud. We already have it setup to overlay onto geometry created with VPB and I was hoping it would "just work"(tm) for the clouds. Unfortunately it seems to have no effect at all on cloud despite it having been inserted into the graph in the same manner that the vpb geometry was. The point cloud is being rendered with a custom shader setup but I didn't come across anything saying that that would be an issue. Is there anything I need to do to the point cloud's graph to make it so it will accept the overlay or is this a limitation of the overlay system? Thanks in advance, - Loren _______________________________________________ osg-users mailing list [email protected]<mailto:[email protected]> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected]<mailto:[email protected]> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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